38063-40-0

Basic information

• Product Name: methyl(methylidene)silane
• Synonyms: Methyl(methylene)silane; silane, methylmethylene-
• CAS NO: 38063-40-0
• Molecular Formula: C₂H₆Si
• Molecular Weight: 58.1545
• Mol File: 38063-40-0.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: methyl(methylidene)silane(CAS DataBase Reference)
• NIST Chemistry Reference: methyl(methylidene)silane(38063-40-0)
• EPA Substance Registry System: methyl(methylidene)silane(38063-40-0)

Safety Data

• Hazardous Substances Data: 38063-40-0(Hazardous Substances Data)

Upstream product

• 18107-29-4 methoxypentamethyldisilane 
• 10124-62-6 1,2-dimethoxy-1,1,2,2-tetramethyldisilane 
• 78715-28-3 5,6-Bis(trifluormethyl)-2-methyl-2-silabicyclo<2.2.2>octa-5,7-dien 
• 74-85-1 ethene 

Downstream Products

• 14857-34-2 dimethyl(ethoxy)silane 
• 18033-75-5 dimethylmethoxysilane 

Relevant articles and documents

Gas-Phase Kinetic Study of the Prototype Silylene Addition Reaction SiH2 + C2H4 over the Temperature Range 298 - 595 K. An Example of a Third-Body Mediated Association

Time-resolved studies of silylene, SiH2, generated by laser flash photolysis of phenylsilane, have been carried out to obtain rate constants for its bimolecular reaction with ethene.The reaction was studied in the gas phase, over the pressure range 1 - 100 Torr (in SF6 bath gas) at five temperatures in the range 298 - 595 K.The reaction of SiH2 with C2H4 is pressure dependent, consistemt with a third-body assisted association reaction to form silirane.While silirane was too labile to be detected, vinylsilane, another possible product, was ruled out by GC analysis.Extrapolation of the pressure dependent rate constants gave the Arrhenius equation: log(k/cm3 molecule-1 s-1) = (-9.97 +/- 0.03) + (2.9 +/- 0.2) kJ mol-1/RT ln 10.These parameters are consistent with a fast, nearly collision-controlled, association process.RRKM modeling, based on a consistent transition state for silirane decomposition, gave a good fit to the pressure dependent curves.The calculations employed a weak collisional deactivation model and confirmed (within +/- 12 kJ mol-1) the most recent theoretical value for ΔH0f(silirane) of 124 kJ mol-1.An enthalpy surface for the reaction highlights the importance of entropy, rather than enthalpy (or energy), in determining the breakdown pathway of silirane.

Hetero-?-Systems, 9. About the Relationships between Silaethenes and Methylsilylenes

Silaethenes 1 and the isomeric methylsilylenes 2 are separately existing species, but can readily be interconverted in an argon matrix via a photochemically induced 1,2-H shift.In case of the thermal excitation in the gas phase examples for both directions have been dedected spectroscopically: the isomerisation of a silaolefin into the corresponding silylene (1d -> 2d) and the formation of a silene from a silylene (2f -> 1f).